460 stock short block revisions/questions
Okay, after my first thread, I have done the following (based on what I have either learned from reading countless posts, or asking questions to forum members offline).
4700# ish pound 76 Mercury 2 door Grand Marquis.
C6 with 2400 stall
3.50 Traction-Loc rear
I have purchased the following:
Comp Cams XE262h cam, valve springs, and lifters.
Holley 750 DP set up and built by a local racer with years of hi-performance Holley builds.
Scotty the Mad Porter's Distributor
Stan's 1-7/8" long tube headers
Holley 135gph mechanical fuel pump
RPM Air Gap intake
Cloyes true roller 1968-1971 "straight up" timing set
Not that it really matters, but new water pump, new oil pump, Felpro Gaskets, high Zinc oil to break in cam, synthetic oil for afterward, etc.
My question(s) are as follows:
I had intended to have my builder build (read modify) my stock short block with the stock internals, the new 262 cam, new lifters, new springs, etc and do a mild port on my D3 heads as per Scotty's instructions.
My builder looked at my pile of parts, and said, "Why don't you go with the Edelbrock RPM heads and a XE274h cam?"
My question is this, after a lot of reading here, it appears I may have issues with valve clearance if I do. An old thread that was never really "finished: entitled "Comp Cams Xtreme Energy" a guy asked the same type question and was handed a reasonable pile of responses ranging from "Should work" to "wont work".
Has anyone done it? Can I do it without issues? I don't want to buy the 272 cam, stick it in, have him clay the pistons, and say, "Well, I wish ......"
Id it'll work, I'll return the XE262h and buy the Edelbrock heads, and XE272h cam. If it wont, I'll stick with the D3 heads, mild port, etc.
This motor will be used for about 3-4 months at which time I am building a stroker to replace the "Stock" 460.
The car will se street and strip use, and I want to keep RPM down at maximum of 6k for longlevity.
I'm trying to have these mods made by next weekend for a car show for what it's worth, so if there's going to be head/valvetrain changes, I'm going to need to expedite the parts tomorrow.
Thanks in advance.