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01-08-2020, 11:12 PM | #21 | |
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Re: High compression head choice.
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01-09-2020, 06:03 AM | #22 |
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Re: High compression head choice.
so does anyone offer the aluminum Lions head or Thomas?
every time I look, I see sold out. I want a head with a little wow factor. I attempted to buy a couple from someone on here I wont mention and I was left by the wayside- deposit and all, though I did recve a refund. wouldnt consider that route again. |
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01-09-2020, 08:01 AM | #23 |
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Re: High compression head choice.
Question: I believe the 6:1 head is a little thicker than the stock and 5:1 head. If that is the case what studs would be used with 6:1 head? I know grade 8 but what length? A friend installed a 6:1 head on his engine and the nuts would barely go all the way on the stud..
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01-09-2020, 10:08 AM | #24 | |
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Re: High compression head choice.
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01-09-2020, 11:53 AM | #25 | |
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Re: High compression head choice.
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01-09-2020, 12:04 PM | #26 |
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Re: High compression head choice.
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Pouring Babbitt bearings is becoming a lost art. Should you over-stress your old bearings? |
01-09-2020, 12:08 PM | #27 |
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Re: High compression head choice.
The general consensus I've read seems to be that the max you should put on Babbitt bearings that have not been recently rebuilt is around 6.5:1, +/- 0.5.
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01-09-2020, 12:12 PM | #28 |
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Re: High compression head choice.
Harpkatt, Your Winfield should give you good performance with no problems, just limit the spark advance because the higher compression will burn quicker than stock. If it is aluminum, it is a repro. I ran a Cyclone 7.5:1 crows-foot for many years and many miles with no problems. It is very similar to the Winfield crows-foot head. read my post above.
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01-09-2020, 02:03 PM | #29 | |
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Re: High compression head choice.
Quote:
That's good to know, perhaps my friend ran his studs in too far. I am moving up from a Snyder 5:1 head to 6:1. New build with babbit mains and inserted rods. Steve |
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01-09-2020, 02:11 PM | #30 |
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Re: High compression head choice.
thx Alex!
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01-09-2020, 08:23 PM | #31 |
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Re: High compression head choice.
I think Jim mentioned it earlier, to much advance will hurt babbitt quicker than anything. 26 deg. is plenty.
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01-10-2020, 12:31 PM | #32 |
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Re: High compression head choice.
Babbitted main bearings do very well, I've run Bonneville at 167 mph on babbitt mains, still in good shape. Rods not as well but still no need to worry about them.
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01-10-2020, 12:52 PM | #33 | |
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Re: High compression head choice.
Quote:
David Serrano |
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03-13-2020, 05:30 PM | #34 |
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Re: High compression head choice.
For those that have a Snyders 6.1 head are you torquing to 55 or 65 lbs?
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03-13-2020, 07:44 PM | #35 |
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Re: High compression head choice.
TerryO, I have been running Brumfeld 5.9 heads for over 30 years now. Three different heads on three different engines. Still have one in a box to be put on my next engine build. Never had a problem with them. that i did not give to myself.
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03-13-2020, 10:13 PM | #36 |
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Re: High compression head choice.
I have a brumfield and a 6/1 both are good running heads the 6/1 seems to have more lugging power
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03-13-2020, 10:31 PM | #37 |
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Re: High compression head choice.
Building performance in any engine requires a balance.more compression? add more fuel,more exhaust better spark control...and a better cam.Look at it this way..a model a engine,stock flows at about 180 CFM..180 cubic feet of air flow. A stock Zenith,even a B zenith flows at about 80 CFM,your basically leaving half the fuel/air mixture out of the equation.Stromberg 97 flow rate matches the model A flow..compression increases are great but reduce your tolerance for timing deviation..in short,run a mechanical advance distributor,stop the hand work. Lastly,now that air flow ,compression and precise timing is nailed,open your exhaust some..
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