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General Category => General Discussion => Topic started by: amamet on November 13, 2025, 03:51:44 PM

Title: is this a lemans 1 head? im a bit stumped
Post by: amamet on November 13, 2025, 03:51:44 PM
The numbers dont correspond to lemans heads numbers but the manifold takes 6mm bolts. whatcha think?  found this in stash of old parts I have
thx
allen


(https://i.ibb.co/7JLXycqw/IMG-1672.jpg) (https://ibb.co/7JLXycqw)

(https://i.ibb.co/LzstgH0W/IMG-1671.jpg) (https://ibb.co/LzstgH0W)

(https://i.ibb.co/LhCCm1nc/IMG-1673.jpg) (https://ibb.co/LhCCm1nc)

(https://i.ibb.co/MDgCY7Wm/IMG-1674.jpg) (https://ibb.co/MDgCY7Wm)
Title: Re: is this a lemans 1 head? im a bit stumped
Post by: PeteS on November 13, 2025, 04:37:43 PM
It appears to be a LM1 head. How deep is the squish band. It appears to be pretty shallow. Many think .040” is minimum height.

Pete
Title: Re: is this a lemans 1 head? im a bit stumped
Post by: Frenchfrog on November 13, 2025, 05:07:09 PM
To confirm you just need to check the valve sizes....certainly looks LM though
Title: Re: is this a lemans 1 head? im a bit stumped
Post by: amamet on November 13, 2025, 05:10:34 PM
its bare, no valves.  what else can I measure like it is?
Title: Re: is this a lemans 1 head? im a bit stumped
Post by: PeteS on November 13, 2025, 05:23:38 PM
its bare, no valves.  what else can I measure like it is?

The diameter of the valve seats. Should be slightly over 44 and 37 mm.

Pete
Title: Re: is this a lemans 1 head? im a bit stumped
Post by: Turin on November 13, 2025, 08:16:17 PM
Without the valves and a caliper it's hard to check. the 6mm intake bolts holes indicate lemans heads,

Here are some comparison shots I took

(https://i.ibb.co/rGptg4c2/850-Le-Mans-heads-3.jpg) (https://ibb.co/rGptg4c2)

(https://i.ibb.co/wZdBZXnV/850-Le-Mans-heads-4.jpg) (https://ibb.co/wZdBZXnV)

(https://i.ibb.co/DDBHFqDb/850-Le-Mans-heads-5.jpg) (https://ibb.co/DDBHFqDb)

(https://i.ibb.co/pBbrP3t0/850-Le-Mans-heads-6.jpg) (https://ibb.co/pBbrP3t0)

(https://i.ibb.co/PGddLgN8/850-Le-Mans-heads-7.jpg) (https://ibb.co/PGddLgN8)