12-01-2008, 01:57 PM
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CC Member
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Join Date: May 2008
Location: Waikoloa,
HI
Cobra Make, Engine: Street Beast "Grabber Orange"/Silver stripe w/418W 520HP full roller, T5. and: Backdraft #814 RT3B "Black Label" "Magic Black"/Sterling Grey stripe, 408W, full roller, 475HP, T5
Posts: 165
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Not Ranked
Hi all, Thanks fo all the info so far. I came across an incredible deal on a new fully CNC ported set of Pro Topline/RHS heads on a clearance sale at Livernois motorsports so I bought them today. They flow 303 on the intake and 227 on the exhaust at only a .550 lift. Livernois has a great reputation for their porting jobs and they use only the best components in their builds so i think i did a good thing. These were about half the usual $1,900+ on the sale. I got them for just $999.99 with dual springs good for up to a .670 lift, guide plates and studs. They have 64cc chambers with 2.02 intake and 1.60 exhaust stainless valves. They said that these heads were used in a lot of 408 and 418 builds they have done and performed very well.
So that is done and I am happy with a really good set of heads at a great price. (They have 7 sets left I think if anyone wants a pair they will go very fast.)
I made an error in stating my intake/carb in my original post, it IS a "Performer RPM dual plane Air Gap" intake and the Holley is a 770cfm dual pumper not a 750CFM as I stated before.
So, it's on to the cam question and I will check out all the ones you guys have mentioned but am a bit confused about the "retro" fit stuff. I think that some of the cams that have been mentioned do not come in "retro" roller version so if anyone could help me clear up that point I would be glad to learn about it. I will also be needing the "retro" hydraulic roller lifters I suppose? This would not be an issue with flat tappet cams but the rollers need to be "retro" I think since the block was not made for rollers originally.
Has anyone used, or know of someone who has used, the new "Thumper" line of cams from Comp Cams? They come in the "retro" type and in kits with matching "retro" lifters. Hopefully I will get the cam selection done as soon as I check out your various suggestions and confer with the guy who is building the short block for me.
The cam is a really important choice so I hope I get it right!
Don
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