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  Topic Review (Newest First)
03-02-2018 08:43 PM
frdnut
Re: Engine build advice 351w d4ae

Quote:
Originally Posted by Jafo View Post
Gday rabbit,
I have a 408 in my 68 and the exhaust was the big issue as custom header I was quoted $3000 as no one in Australia put 351 in these models. After some investigation got a full flow master stainless system from the US for $750 Aud delivered.
Engine dart 351w with scat crank 4340 and H beams flat top piston Edelbrock Victor 60cc heads and rpm air gap intake with Holley 750 ultra
I went with mechanical roller 243/[email protected] lift .600
C4 full manualised with 5 pinion planetary hard input/ output 3800 stall 10 inch converter 3:55 9 inch revs at 2500 at 60mph
I had the diff shortened 1.5 inches each side so I can fit 275x40x17 under the ass looks tuff...
Car is weekend driver and a few days at the track. Runs 11.5 @ 121mph hope this helps you out.
Did you end up having custom headers built? I used the hooker 6208s in my 68. 1 3/4 primaries with slip fit pipe on each side. They fit well but the flange in the headers was a little too narrow compared to my vic jr ports creating a bit of a mismatch. My 1/4 mile numbers are pretty much identical to yours but I am running quite a bit more lift and duration. I also run a vic jr intake and 950HP holley carb.
02-24-2018 02:21 AM
Jafo
Re: Engine build advice 351w d4ae

Gday rabbit,
I have a 408 in my 68 and the exhaust was the big issue as custom header I was quoted $3000 as no one in Australia put 351 in these models. After some investigation got a full flow master stainless system from the US for $750 Aud delivered.
Engine dart 351w with scat crank 4340 and H beams flat top piston Edelbrock Victor 60cc heads and rpm air gap intake with Holley 750 ultra
I went with mechanical roller 243/[email protected] lift .600
C4 full manualised with 5 pinion planetary hard input/ output 3800 stall 10 inch converter 3:55 9 inch revs at 2500 at 60mph
I had the diff shortened 1.5 inches each side so I can fit 275x40x17 under the ass looks tuff...
Car is weekend driver and a few days at the track. Runs 11.5 @ 121mph hope this helps you out.
01-31-2018 06:19 PM
Rabbit67 Thanks for your input. The afr 205's are 58cc with hydr roller springs. All good info.
01-29-2018 08:34 AM
n2omike
Re: Engine build advice 351w d4ae

Quote:
Originally Posted by Rabbit67 View Post
Hi im aiming to keep it at
.030 over so 357. Street use 205 afr heads , 775 cm street avenger ultra carb. Rebuilt c4. 9" rear. 3.25 or 3.5 gears.
We need to know the combustion chamber volume of the AFR 205 heads you are using. If they are the most common 58cc variants, THE COMPRESSION RATIO WILL BE TOO HIGH when used with flat top pistons. It WILL knock and ping badly. You will need to use race gas.

Your options are to either use more of a 'race' cam, which will bleed off more cylinder pressure, or to drop the compression ratio down to a more suitable number. There is no 'magic' camshaft that solves all your problems.

A camshaft that would work with your compression ratio on pump gas would produce little power below 3k rpm, and would want shifted at close to 7k rpm. It would require a very loose torque converter, that would be a pain to drive on the street.
01-29-2018 06:27 AM
Rabbit67 Hi im aiming to keep it at
.030 over so 357. Street use 205 afr heads , 775 cm street avenger ultra carb. Rebuilt c4. 9" rear. 3.25 or 3.5 gears.
01-28-2018 03:45 PM
n2omike
Re: Engine build advice 351w d4ae

Those heads come in both 58cc (most common) and 72cc.
58cc heads with the flat top pistons will come out to around 11 to 1... which is too high for pump gas and a cam that has good street manners. 72cc heads with flat tops will come out to around 9.4.
01-28-2018 02:16 PM
Rabbit67 New +30 hypereutectic coated flat top pistons with new rings
New Uprated i beam 683g conrods with up rated bolts
Reground crankshaft +30 main
01-28-2018 02:15 PM
Rabbit67 Hi. Yes ive got afr 205's, flat top pistons and street avenger 775 ultra vacume sec carb. Cheers.
01-28-2018 12:16 PM
n2omike
Re: Engine build advice 351w d4ae

Quote:
Originally Posted by Rabbit67 View Post
Hi. Thankyou for our words.

Ideally i want to keep it at 351 +.030 as the engine has been rebuilt already, getting a stroker kit plus fitment/balancing will be another 2 gran plus gbp atleast....

No racing, just street use and not a daily driver.
Lots of fun from light to light.
Rough idle for that classic sound but reasonably usuable in town traffic.

Cheers

...
Okay, keep cam at 230 @ 0.050" with a lobe seperation of 110 using a carb, and around 9.5 to 1.
That being said... do you already have the pistons and heads?
01-28-2018 10:38 AM
Rabbit67 Hi. Thankyou for our words.

Ideally i want to keep it at 351 +.030 as the engine has been rebuilt already, getting a stroker kit plus fitment/balancing will be another 2 gran plus gbp atleast....

No racing, just street use and not a daily driver.
Lots of fun from light to light.
Rough idle for that classic sound but reasonably usuable in town traffic.

Cheers

...
01-28-2018 07:46 AM
n2omike
Re: Engine build advice 351w d4ae

Quote:
Originally Posted by Rabbit67 View Post
Thanks for the advice, however i have the engine, heads carb ect so your advice isnt really relevant. I wont be building the engine, i have a guy to do that, the rest of the build i will have a go at, possibly outsourcing the transmission build too... so what i need is advice on parts as in cam profile and stall converter as in my question.

Regards

Thanks anyway.
Cam depends on what engine displacement you settle on. Using a factory 351W block, I would recommend building a 408. Factory 351W's have a 3.5" stroke. The 4" stroke of a 408 fits great, and there are well tested kits out there.

Converter will depend on the rev range, and what you want to do with the car. If you have a lot of drag racing on slicks in mind, you'll want a loose one that allows the engine to launch higher in the rev range. If you have trips and road racing in mind, you'll want one a lot tighter.

So, in order to answer the questions, you'll need to know the displacement, rev range, and intended use. You've pretty much covered intended use, so the converter will be on the tighter side, but the rev range and displacement need to be decided on. The ideal compression ratio will also depend on the cam used. For a typical non-race build that desires a long, low maintenance service life, a mild 408 with a hydraulic roller measuring around 236 @ 0.050" on the intake and a 10" converter with around a 2800-3000 rpm stall is a good starting place for the parts you have chosen. Will yank that car around like nobody's business! Shift point will be around 6k rpm, and you'll want a compression ratio between 9:1 and 9.5:1. Any higher with a cam that size, and chances are, it will knock.
01-28-2018 06:59 AM
Rabbit67
Re: Engine build advice 351w d4ae

Quote:
Originally Posted by n2omike View Post
If you're not use to all the 'gotchas' when building a custom engine you're not familiar with... and insist on doing it yourself... you're likely going to be in for a frustrating education. You will likely screw stuff up, which could end up costing lots of time, money and rework.

You've got a LOT of things to consider, such as what you need to do to install a hydraulic roller cam... such as distributor gears, etc. You need to make sure you know how to adjust valvetrain geometry. There are forums where people will help walk you through all this... but just realize you're in for a tedious journey.

Another option, is to buy a well matched, ready to go engine from a builder such as http://www.fordstrokers.com. They seem to do decent work.

Good Luck!
Thanks for the advice, however i have the engine, heads carb ect so your advice isnt really relevant. I wont be building the engine, i have a guy to do that, the rest of the build i will have a go at, possibly outsourcing the transmission build too... so what i need is advice on parts as in cam profile and stall converter as in my question.

Regards

Thanks anyway.
01-28-2018 06:56 AM
Rabbit67
Re: Engine build advice 351w d4ae

thanks ive been advised 3.25 or 3.5 before so this adds to that
01-28-2018 06:26 AM
n2omike
Re: Engine build advice 351w d4ae

If you're not use to all the 'gotchas' when building a custom engine you're not familiar with... and insist on doing it yourself... you're likely going to be in for a frustrating education. You will likely screw stuff up, which could end up costing lots of time, money and rework.

You've got a LOT of things to consider, such as what you need to do to install a hydraulic roller cam... such as distributor gears, etc. You need to make sure you know how to adjust valvetrain geometry. There are forums where people will help walk you through all this... but just realize you're in for a tedious journey.

Another option, is to buy a well matched, ready to go engine from a builder such as http://www.fordstrokers.com. They seem to do decent work.

Good Luck!
01-28-2018 05:01 AM
falconfred
Re: Engine build advice 351w d4ae

I have a 3.70 rear in mine, and if I had it to do over again, I would install something around 3.50. The 3.70 works out to about 3000 rpm at 60 mph , which is a little buzzy on the highway.
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