High Compression Head, I think Not

[Tom Wesenberg]

I wonder what makes this seller think this is a high compression head?

https://www.ebay.com/itm/Model-A-For....c100033.m2042

[MikeK]

Enough carbon deposits to bump it up to 4.3? I wonder why Model A people think 6.0 is high compression? My lawn mower is 7.5:1.

[BNCHIEF]

Because it says so in the vendor catalogs, but that really is not the case as you say.

[pAAt]

Tom, I didn't know most of mine must be high compression ! They look just like that one Pat

[old31]

Silly, the guy was high when he did a compression test

[tbirdtbird]

The compression was so high it push backward on the water pump impellor shaft and wore deep into the web in the head.
Oh wait, original 4.2 heads did that all the time......and we all use a collar to stop that now. OK, I give, it is hi-comp because he says so
LOL good find, Tom, so when are you gonna install it?

[Tom Wesenberg]

The compression was so high it push backward on the water pump impellor shaft and wore deep into the web in the head.
Oh wait, original 4.2 heads did that all the time......and we all use a collar to stop that now. OK, I give, it is hi-comp because he says so
LOL good find, Tom, so when are you gonna install it?

Not me, I bought the 5.5 head from Bert's when I stopped there about 10 years ago. Still haven't installed it yet though.
Time to make another trip to Bert's to check out his new location.

[BNCHIEF]

His new place is set up real nice Tom.

[Rowdy]

Looks like a common $15 take a chance head. Rod