PRH's latest activity
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PRH replied to the thread KB243 Hyper Piston Confusion.SRP 142068 are shown as 1.804” C/H -
PRH replied to the thread Heads for 440.Well, in that EM test it was about 40hp from 906’s with a little work to the RPM’s. When the rpm heads first came out over 20 years...
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PRH replied to the thread Valve Spring Installed Height.It was over 30 years ago, so I don’t really remember, but probably whatever it took to get about 130 on the seat.
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PRH replied to the thread Valve Spring Installed Height.I had it done on a 108lsa(I don’t remember why). It was a little soft on the “bottom”, and I didn’t have enough stall(4900) or...
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PRH replied to the thread Valve Spring Installed Height.I looked up the cam I ran in my 340 with the Crower 68405 springs……Crower 31313. Shifted it at 7500.
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I have these pistons in my 340. They were .018 above the block.
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PRH replied to the thread Heads for 440.I doubt it. On a build similar to yours, but with a HR cam, Enginemasters tested a 906 v stealth v rpm v tf240 and it was about a 20hp...
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PRH replied to the thread Heads for 440.They rarely need much work, but it’s also rare that they need nothing. Like most assembled performance parts……some are better than others.
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PRH replied to the thread Heads for 440.60929- FT cams 60925- HR cams
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PRH replied to the thread Heads for 440.The only difference between those heads are the valve springs.
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PRH replied to the thread Heads for 440.As I previously mentioned…….the plugs are not an issue with the FW headers. I have customers running them with stock rockers. I...
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PRH replied to the thread Heads for 440.Yes, The cnc stealths flow more than their unported counterparts.
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PRH replied to the thread Heads for 440.Speedmaster 74cc heads are copies of Ede Victor heads and require some special parts to be able to use them. Offset rockers being the...
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PRH replied to the thread Maximum lift with stock J heads.Imo, any 50year old heads that you’re planning on using as part of your “performance upgrade” plans should be disassembled and...
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PRH replied to the thread KB243 Hyper Piston Confusion.Seems pretty clear to me that the piston would be sticking out .018” if the block were 9.600”.