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Discussion Starter · #1 ·
looking at those RHS heads that have the 215cc runners for my 402w they seem much cheaper then lets say the AFR205s, are they a good bang for the buck? they flow a little better then my roush 200 heads at mid lift and .600, just wondering if they need some work to clean them up, what valves do they come with, i would upgrade all the valvetrain anyway, anybody using these heads on the strokers?.
 

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If you are going to ungrade all the valvetrain i would just buy them bare.Here is some info in the heads before comp cam took over top line. all of the heads flow pretty good. what ever head you go with i would port match and do some bowl work.


application: Street 302-351, 1500-6500 rpm
Intake Runner: as cast 180cc
Peak Intake Flow @ 28": 276cfm @ .700 lift
Valves: 2.02" intake/1.60" exhaust
Intake Manifold: Edelbrock 5021
Intake Gasket: Fel-Pro #1262
Spark Plug suggested starting range: Champion C57C
Part# F120-4000-200 (64cc combustion chamber)
Part# F120-8000-200 (58cc combustion chamber)

Application: High RPM Street/Race 351-421, 3500-8000rpm
Intake Runner: as cast 200cc
Peak Intake Flow @ 28": 286cfm @ .700 lift
Valves: 2.02" intake/1.60" exhaust
Intake Manifold: Edelbrock 5021
Intake Gasket: Fel-Pro #1262
Spark Plug suggested starting range: Champion C57C
Part# F120-4000-215 (64cc combustion chamber)
Part# F120-8000-215 (58cc combustion chamber)

Application: High Performance 347-421, 4500-8500rpm
Intake Runner: as cast 215cc
Peak Intake Flow @ 28": 314cfm @ .700 lift
Valves: 2.08" intake/1.60" exhaust
Intake Manifold: Edelbrock 5021
Intake Gasket: Fel-Pro #1262
Spark Plug suggested starting range: Champion C57C
 

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The 215s would be great for your goals and have a lot of potential for when you want to up the ante. I would even suggest the 215s on 351Ws that are taken to and above 6500RPMs and 200s for under 6500RPMs. The 2.08 valves clear my KB 116 pistons valve reliefs. They do not need any cleanup work in the bowls and probably won't need to be gasket matched since my 2 sets both matched great as cast to the 1262 gasket. They have a very good bowl shape and a good short turn. At most a light clean-up with a cartridge roll but it really isn't need but I do suggest polishing the chambers and exhaust ports as I would for all performance heads. Don't let the intake runner size scare you, they still make a lot of torque because of the great low/mid lift flow and port design. They are a much better value and better machining than the Windsor Sr heads or current Roush 200 heads which is why I went with them in the first place. The intake ports are nearly .300" higher inside and the bowls are deep with MUCH better short turns compared to the Windsor Sr/Roush 200 heads. Maybe ifWorld Products ACTUALLY came out with the Windsor R 235 head like they have been saying for the last 3 years it might be better but these Pro Topline heads were by far the best bang for the buck. Now that RHS/Comp Cams owns the company they bumped the price waaay up but hopefully will continue R&D and/or offer a bigger head than the 215. Maybe offer a fully CNC ported version to rival or surpass AFRs 225s. My 215s are at 235CCs after a BASIC porting. There is plenty of room for 2.12/1.6 valves or 2.10/1.625 valves leaving the minimum required .030" between the intake and axhaust valves. There is no question that with 2.12 valves and ported accordingly that 335-340CFM(orn more) intake flow is do-able. The exhaust ports are a little small but that was done so the majority of the available headers will bolt on and work well without the port being larger than the header openings. I believe a 1 5/8" header would work and 1 3/4 would be a good match. They can be opened up much larger for bigger headers. My exhaust port exits are the as cast size since I didn't know what headers I would eventually wind up with. Now I can go ahead and open up the port. The valves I used are +.200 long SBC 2.08/1.60 Severe Duty for a 2.00 installed height. I have since found out my car was lean and jetted it up a few times the last weekend of the season last year in mid October and ran a went from 10.20s to a 9.81 at 135 naturally aspirated with a small street solid roller. The next pass after that I jetted it up another 2 sizes front/back with another 2* advance and put it on the bumper soo hard all 4 tires came off the ground and the front came crashing down and bent the frame and broke many front suspension parts. That was also with the exhaust removed this day so with the correct cam and exhaust ports being opened up for the 1 7/8 headers with exhaust and a set of tunable Cal Tracs on the back that I have yet to install to keep the front end down it should run 9.50s in street trim no juice at 3350#s. I like these heads
 

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Starting a 393 project myself in a couple of months and was going to use my stock ported D0 351 heads, but with having to cut the seats, buy new valves, install new guides, machine for guide plates/studs and machine for the seals, it might not cost me too much more for a good set of aftermarket iron heads. Anyone know how much the bare RHS Iron 200 heads cost??
 
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