new heads, now loss of power

[norcalmike]

ok. stock 1600 DP. i replaced my heads because the exhaust studs were stripped, repaired and stripped again. so, i bought new Auto Linea G01 heads. Now it seems like i have lost some top end power. i made sure everything was right. timing, valve adjust, heads torques properly, etc. I have put new heads on a used block before with no problems. but this time, im stumped as to what could be the issue. any ideas?

[RA 70]

Have the right sized spark plugs installed??

[norcalmike]

[vwracerdave]

Your old heads may have been flycut which would increase the compression ratio. your new heads may have larger chamber CC's giving you a little less compression ratio.
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[mark tucker]

or it's behind door # 5. these heads dont leak exhaust and it runs quieter& smoother and dosent "sound as fast". or what dave said. wack em in the head.

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[74 Thing]

Exactly, what were the cc's of the new head vs the old heads. Check the old heads since you probably still have them on a bench then you can figure out your compression ratio if you know your deck height, and you can probably get the cc's of the new heads you are running from your supplier.

[norcalmike]

I was thinking that must be it but i was hoping that wasnt it. well, at least its an easy fix (sort of). Thanks

[norcalmike]

[66brm]

[mark tucker]

butt whay the cc kit is like what??$12.00.well worth it.I like to use the green alcohaull ,easy to see and fills all the spaces .some use auto trans fluid but it's hard to get all the bubbles out of the corners sometimes.spray the inside of the seinge with wd or something so things go smoothley.

[norcalmike]

Link


I have never CC'd a head before. does everyone agree that this is the right way to do it?

[jfats808]

I do it the same way in regards with the grease on the edges. I would never use a sticky fluid. Fluids of the consistency of oil might be harder to get the air bubbles out quickly. The cleaning effort hardly seems reasonable to me. I just use water and get the air bubbles out. Wipe clean with a rag and call it good.
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[madmike]

Make sure your getting full throttle,Butterfly open all the way?,I've seen that a few times simple fix,Madmike
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[hotrodsurplus]

[mark tucker]

yup that vid looks pretty good, but I like the green alcohaul,have used trans fluid before it works ok,also use a slight amount of greese in the valve seats if the spring are not on them, tighten the plug .and dont forget to write down what chamber is what . and is a ml the same as a cc??

[66brm]

Yep 1 mL is 1 CC equal to 1 gram of weight, pure water at sea level Haven't been in school since 1994 and still remember that stuff
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[norcalmike]

if memory serves, i do remember seeing a step on the new G01 heads. my old heads didnt ( i think). well, looks like im gonna undo a new head job and fix it right

[mark tucker]