Solid flat tappet to solid roller - Page 2 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #16 of 20 (permalink) Old 10-22-2008, 11:53 AM
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Re: Solid flat tappet to solid roller

Not to me.... some slight gain , yes .... but not enough to justify (roller) cam changing expense imo.

"Many claim experience and knowledge based upon how often they dispense advice" (Greg Banish)
Oh so true....
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post #17 of 20 (permalink) Old 10-22-2008, 02:07 PM
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Re: Solid flat tappet to solid roller

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Originally Posted by cmf60 View Post
Not to me.... some slight gain , yes .... but not enough to justify (roller) cam changing expense imo.
That argument can be made for -anybody- considering switching from a solid flat tappet to a solid roller.

With the big cubes and small heads, his is probably one of the better candidates for a solid roller... but is it worth the expense???? It just depends upon how bad he wants a little extra power.

Personally, I frequently street drive my car, so I enjoy the low maintanance of the solid flat tappet. I don't like worrying about solid roller lifters and broken valvetrain parts.... as the quick valvetrain motion and associated heavy springs put a lot of stress on things.

Last edited by n2omike; 10-22-2008 at 02:10 PM.
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post #18 of 20 (permalink) Old 10-22-2008, 03:32 PM
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Re: Solid flat tappet to solid roller

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That argument can be made for -anybody- considering switching from a solid flat tappet to a solid roller.
No, not really Mike. We have two major influencing factors here, large(ish) displacement and mediocre head flow. If cylinder demand exceeds head flow capacity gain's are small, you may get alittle better filling earlier in the intake stroke but during the "bulk" cylinder filling period (at max piston speed), the head is already at its capacity..... gains are small/none, in other words - the heads are the bottleneck. If the head has some additional (or untaped) capacity, gains will be much larger ofcourse.

It reminds me of a class racing scene we were involved in which is using smaller displacement engines and (equally) restrictive heads. They relaxed a rule regarding only FT cams being allowed....everybody thought - GREAT...had roller cams ground up in all sorts of configurations, expecting much better performance. It didn't happen. Some of the "clever" ones had small gains in lap times... and some had none.
Huhh???? Whats going on here? They didn't realise at the time that the heads were the limiting factor , not the cams. There are STILL guys running FT cams even now as there is very little in it.... and they generally win the reliability "race" hands down.

"Many claim experience and knowledge based upon how often they dispense advice" (Greg Banish)
Oh so true....
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post #19 of 20 (permalink) Old 10-23-2008, 09:56 AM
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Re: Solid flat tappet to solid roller

With my 347/AFR185's/funnel web, I went from a trick flow stage 3 hydro roller cam to a comp cams 294s solid roller I went from a 12:80 to a 12:65 and I believe there is more left in it. The big gain I saw was being able to turn it to 7500 opposed to a valve floating 6500 on the hydro. The draw back to this is I'm running 4:88 's im my galaxie with 28" tall tires and I am still not going through the traps at an ideal rpm.I think if I drop to a 26" tire I would gain quite a bit more. But the 88's are already causing traction issues and It will only be worse with the 26" tall tires.
Now changing from a hydro roller to a solid roller cost well over $1200.00 in the end. Is it worth it ????????????? Who can say, but I can now say I got a 347 in a 4000lb galaxie that will go 12:60's and shifts at 7500. Hell yeah its worth it!!!!!!!

64GALAXIE 347 STROKER [email protected]
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post #20 of 20 (permalink) Old 10-23-2008, 12:54 PM
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Re: Solid flat tappet to solid roller

Fair enough 347LX but keep in mind that your 185's flow a fair bit more than the RPM's.... and your 50 cubes less.
Nice numbers at that weight though....

Edit: I guess what I am trying to say here is that for the cost involved, you would get FAR more benefit from putting the dollars into some better heads , (even with the same cam) than your ever going to get from going to a roller.... and the cost to change is going to end up around the same or less by the time you sell the RPM's.
Its a bang for your buck thing.... the heads are the issue, they are just too "small" for the cubes.

"Many claim experience and knowledge based upon how often they dispense advice" (Greg Banish)
Oh so true....

Last edited by cmf60; 10-23-2008 at 01:19 PM.
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