HEI use on the 1968 Olds 350 motor
#1
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Thread Starter
HEI use on the 1968 Olds 350 motor
1 quick questions:
My mech wants to use the HEI on the '68 motor instead of the points
I need to know if the plugs that are in the 1985 307, which are new (10 miles on them) with fit the 1968 block.
I know the gap will have to be .045 instead of the .032 for the points, but are the R45S standard plugs I bought for the '68 are the same size as the 41-630 plugs from the '85 307?
My mech wants to use the HEI on the '68 motor instead of the points
I need to know if the plugs that are in the 1985 307, which are new (10 miles on them) with fit the 1968 block.
I know the gap will have to be .045 instead of the .032 for the points, but are the R45S standard plugs I bought for the '68 are the same size as the 41-630 plugs from the '85 307?
#3
Assuming a stock (or close to it) engine:
He is probably not comfortable dealing with points.
They will not fit the block.
If you want to know if they will fit the heads, you can try to install them, visually compare them, or have your mechanic check his application guide.
It will not. HEI was part of the '73 emissions package along with (among other things) lower compression, leaner mixtures, and wider gaps to fire those excessively lean mixtures.
Use the same plugs, and gap, that were engineered for your engine. More gap = unnecessary wear on the ignition system.
You will have to use more initial to get enough total advance and you may, or may not, have issues with the advance curve in the HEI.
Norm
He is probably not comfortable dealing with points.
........ if the plugs that are in the 1985 ........ will fit the 1968 block ........
If you want to know if they will fit the heads, you can try to install them, visually compare them, or have your mechanic check his application guide.
........ I know the gap will have to be .045 instead of the .032 for the points ........
Use the same plugs, and gap, that were engineered for your engine. More gap = unnecessary wear on the ignition system.
You will have to use more initial to get enough total advance and you may, or may not, have issues with the advance curve in the HEI.
Norm
#4
Use the same plugs, and gap, that were engineered for your engine. More gap = unnecessary wear on the ignition system.
You will have to use more initial to get enough total advance and you may, or may not, have issues with the advance curve in the HEI.
#6
Dont forget to have him advance the timing an additonal 10 deg or so to compensate for the different timing curve in the HEI. Should come out around 18deg or a little more. I made that mistake when I swapped mine to HEI and could not figure out why she ran like a wet dog...
John
John
#7
Dont forget to have him advance the timing an additonal 10 deg or so to compensate for the different timing curve in the HEI. Should come out around 18deg or a little more. I made that mistake when I swapped mine to HEI and could not figure out why she ran like a wet dog...
John
John
#8
John
#9
Plugs and gap question
Changing the plugs on my 1969 Cutlass today....motor was born with a 2 bbl carb which has been upgraded to a Edelbrock 600 sitting on a Edelbrock Performer rpm manifold. Car has headers and a Summit aftermarket HEI ignition. What gaps are you guys running with similiar setups? Thanks.
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