Quote:
Originally Posted by steverino
Funny, when calling the "tech line" at comp for cam selection advice, I had that "cubicle" feeling after hanging up
Obviously a popular topic here, lots of good info and shared experience , including that last link to more great experience shared by Jim Hand
I also feel that it's two different worlds between HR and HFT cams, and don't see myself considering the HR route anytime soon , so am focusing on the HFT info
I am also uncertain if I'd like the Rhoades lifters (restored stock looking gto convert), but I'd really like to hear them in person if there's anyone in central/eastern MA , southern NH that is running them ? Maybe I could catch up with them at an event somewhere over the summer
On the other hand, (and seemingly supported by that last Jim Hand article linked), I may not absolutely need the variable lifters if I were to switch to an 041 style cam, since I have a manual trans and manual brakes ? (currently I have 14" vac @ idle)
So I'm also wondering if anyone uses an 041 in a 455 with standard lifters , and with 1.65 or 1.5 rockers ?
I guess at 9.4 I could use an 041 cam, but if I wasn't planning to try the Rhoades lifters, what option might I have ?
It's obvious that the Rhoades with certain cams (041 etc) are a proven performer, but what about HFT options with standard lifters ?
My current "plan B" (if dissatisfied with the xe274), was/is the crower 60243 , but I'm not sure how much of a difference I would experience or if it would be worth it
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I'd go right ahead and run the 041 with standard lifters, 1.65 rockers and 9.4:1 compression. Your car has a stick trans and manual brakes, nothing should be stopping you from using that combo in a street 455.
Quote:
Originally Posted by ponyakr
"...Under a different part number however because of the different distributor drive gear it reappeared as the 455 SD cam."
So then, I suppose you could say the 744 grind ran OK in a fairly low comp 455 ? They had originally planned to used the 041 grind cam in the SD455. I've read that it should not be used below about 9:1 CR. So, how would that have turned out ? That brings up the question, what is the minimum CR for an 041 cam in a 455 ? 
Just can't help it. I love to read this Jim Hand stuff. 
http://www.dapa.org/building-a-stron...iac-camshafts/ |
I've never used the 041 cam, but I have used 2 bigger cams than the 041 in a 455 with less than 9:1 compression. Ran the H-O Racing HC-02 (231/243,.512"/516" w/1.65 rockers) and the HC-03 (244/252, .550"/.554" w/1.65s). Only ran the 02 cam for a short time before switching to the 03 cam, in a standard-bore 455 with #197 HO heads at around 8.6:1. It ran great and had low vacuum at idle as expected, manual brake car so it didn't matter.
Sure, higher compression would have been better, but in my situation I was using the parts I had on hand along with the camshaft recommendations straight out of the H-O Racing catalog. The HC-03 was recommended for the 455 HO (a known low-compression engine, right?) with lower gearing, I was using 3.89 cogs with a 28" tall tire:
http://forums.maxperformanceinc.com/...5&postcount=19